Ander thorn



No.-7'70,404- PATENTED SEPT. 20, 1904.

' v H. A. A. THORN. I SINGLE TRIGGER DOUBLE BARREL GUN.

APPLIOATION FILED JULY 20, 1903.

H0 MODEL C g lllllllllllll lflll/ll v lg nll h c y fllllllllll lllllllli-Yll 0 Unites see HENRY ALFRED ALEXANDER THORN,

Patented September 20,1 904.

OF LONDON, ENGLAND.

SENGLE TREGIGER DOUBLE-BARREL GUN.

SPECIFICATION forming part 6f Iletters Patent No. 770,404, datedSeptember 20, 1904;.

Application filed July .20,

To all whom it may concern.-

Be it known that I, HENRY ALFRED ALEX- ANDER T onN, a subject ofthe Kingof Great 151 New Bond street, London, England, have invented new anduseful Improvements in Single-Trigger Double- Barrel Guns, of which thefollowing is a speciwith the. sear of-the second barrel.

fication.

My invention relates to double-barrel guns of th'ekind whereinthecharges of both barrels are designed to be fired by. a singletrigger. As is well khown, there is liability when using guns of thisclass of firing the charge of the second barrel involuntarilyimmediatelyafter the firing of the first barrel. Hitherto the involuntary'dischargeof the second barrel was considered to be due to the fact that therecoil of the gun against the shoulder on firing the first barrelmomentarily moved the gun away from the'trigger-finger and that upon theperson operating the gun instinctively following the trigger up thereaction from the shoulder pressed the trigger against the finger,and-so caused the second or involuntary discharge. In order to overcomethis liability of second discharge, a timer or. other mechanical devicehas been used which allowed for a certain amount of the inoperative oridle movement of the trigger after the discharge of' the first barreland before the trigger blade. moved into firing position relatively Asthe result, of experiments recently carried out it is believed that theinvoluntary discharge of the second barrel is due to the elasticity ofthe hand, wh ich, notwithstanding the fact that the gun is firmly held,yields under the sudden backward leapof the gun, an that instantly underan involuntary convulsive clutch the trigger-finger'is again pressedonto the trigger and causes the second discharge in an incredibly shortspace of time after the first discharge" and while the gun is stillmoving backward toward the shoulder under the recoil.

The object. bf my invention is toprovid e ineans whereby the convulsiveclutch before referred to shall only have the efiectof rel'easingjgtheswinging trigger lever or blade I from astop against which it impingeswhen the trigger is released after the first discharge,

sear of the second barrel, this and which atone end is 1903. Serial No.166,367. (No model.)

are then only in such a manner that upon this second pull the swingingblade does not assume its firing position relatively with the place whenthe trigger is released after the second pull, so that practically theswinging blade in moving over from right to left meets with two stops.

In a suitable arrangement for carrying out my invention I combine with aswinging blade an arrangement of stop mechanism somewhat of the kind.used twenty years ago, wherein a stop-arm pivoted tomovein averticalplane is arranged to cooperate tuated slide working on a blade fixed tothe tri ger andrdesigned to be successively brougll t into positionrelatively with the scars of the right and left hand firing mechanisms.The stop-arm, however, which I use according to my invention is pivoted'upon a vertical axis so that it is capable of moving in a horizontalplane and is combined with a spring.

my improvements applied to it, and Fig. 2 is.

a sectional plan of the same wherein the trigger-blade is shown inposition for discharging the right-hand barrel. Figs. 3 and e are onlytaking with a spring-acviews similar to Fig. 2, but showing difierentpositions of the trigger-blade.

a a are the right and left hand barrels, respectively, and 6]) therespective tumblers,

each of which has arranged in connection with 1t double sears c c in awell-known manner.

.(Z is the trigger, and e isthe trigger-blade, which is mounted on apivot on the said trigger, so that the said blade i free to swinglaterally. r

g is a spring which bears against the blade 6 and tends to move it fromthe right-hand to the left-hand position.

h is a lever pivoted upona' screw or. pin 2' provided with a finger is,engaging with the trigger-blade,- and at the other end with a camprojection Z, which works in conjunction with a cam-surface m, formeduponthe right-hand tumbler Z); the said lever 'pressure upon the triggerserving after the firing of the gun and when acted upon by thecam-surface m to return the trigger-blade to its position beneath theright-hand sears.

Allthe foregoing parts are of ordinary construction, and thereforerequire no further description.

n is the stop-arm,,arranged in accordance with my invention, the saidstop-arm being pivoted upon avertical stud or screw 0 and being actedupon by a spring p, which normally holds it against a stud q, the freeend of the stop-arm w forming an abutment againstwhich the free end ofthe triggerblade will come into contact, as hereinafter described. Inpractice the relative lengths of the trigger-blade and of the arm n aresuch that when their free/ends are in contact they will form a kind of;oggle-that is to say, the point of contact between the said blade andarm will be on one side of a line passing through their pivots, or, inother words, the combined lengths of the trigger-blade and arm end isgreater than the distance between their points of pivoting, andtherefore the swinging' blade will be stopped when its end is in contactwith the end of the arm 41. It will he noticed that the ends of the saidarm and'trigger-blade are slightly beveled, so that they will fittogether when in their locked position.

The operation of the apparatus hereinbefore described is as 'followsthat is to say, whenthe gun is cocked and the blade 0 is in position forthe discharge of the right-' hand barrel the end of the said blade is atsome distance from the end of the stop-arm n, as clearly shown in Fig.2. When the trigger is pulled, it lifts the trigger-blade to theposition indicated by the dotted lines in Fig. l to discharge theright-hand barrel. As the gun recoils the elasticity of the hand allowsthe being momentarily released, so that the triggerblade 6 escapes fromthe scars under the action of the spring g, the end of the said bladecoming into contact with the end of the stop-arm n, as shown in ig. 3.The involuntary clutch pull which now takes place causes the upwardmovement of the trigger-blade, so that the end of the latter, which iscut away, as shown at 7*, Fig. 1, is disengaged from the stop-arm andmovesover under the action of the spring 9 to the position indicated bythe dotted lines in Fig. 3 that is to say, against the sears of thelefthand barrel (4. Upon the release of the trigger after the second orinvoluntary clutch pull the blade swings beneath the sears of the secondbarrel, as indicated in Fig. 4. Upon the opening of the gun the swingingblade is pulled over to the right, owing to the cocking of theright-hand tumbler, the end thereof during its movement striking the endof the pivoted stop} arm n and moving the latter against the pressure ofthe spring 1) sufficiently to pass, whereupon the said pivoted stop-armWlll assume a position in which it will engage with the swinging bladewhen the latter is next operated, as hereinbefore de:

scribed. Y 1

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be-performed, I declare thatwhat I claim is 1. In asingle-trigger double-barrel gun, the combinationwith the trigger and scars of a swinging trigger-blade pivoted upon saidtrigger by a substantially vertical pivot and adapted to engage with thesears of both barrels, of a stop-arm pivoted upon a substantiallyvertical pivot and extending therefrom in a direction toward thetrigger-blade the combined length of saidtrigger-blade and stop-armbeing slightly greater than the distance between their points ofpivoting and said arm having a trigger-blade-engaging portion lying'normally at one side of a line connecting said points of pivotingwhereby the swinging trigger-blade will be stopped by said arm whenmoving in one direction and will be held against further movement insuch direction until the trigger-blade is raised out of engagement withsaid arm, substantially as described. 2. In asingle-trigger double-ha'el gun, the

combination with the trigger and sears of a swinging trigger-bladepivoted upon said trigger by a substantially vertical pivot and adaptedto engage with the sears of both barrels, of a stop-arm pivoted upon asubstantially vertical pivot and extending therefrom in a directiontoward the trigger-blade the combined length of said trigger-blade andstop-arm being slightly greater than the distance between their pointsof pivoting and said arm having a trigger-blade-engaging portion lyingnormally at one side of a line cennecting said points of pivoting, astop for said swinging arm limiting it from movement in a directiontoward a line connecting said arm normally against said stop, saidtrigger-blade beingprovided at its free end with a cut-away portiop,whereby in swinging from the sears of the first barrel discharged tothose of the other barrel, said trigger-blade will strike the ,end ofsaid stop-arm and blade is elevated to permit the cut-away portionthereof to pass said arm and whereby on the return movement of saidblade said arm will yield against the spring-to permit said blade topass, substantially as described.

inner ALFRED ALEXANDER THORN.

\Vitnesses:

JOHN E. BOUSFIELD,

C. G. REDFERN.

be arrested until said 1

